Do not validate challenge if "bid" is "NaN"
Do not validate challenge if "bid" is "NaN"

This can occur if the Session Storage was cleared after login. "bid" was modified but it was surely unintentional and thus should not validate challenge

Signed-off-by: Clément Notin <f4d89ba3944712499c88ae5711c60f16f0f6c9cc@notin.org>

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